Manufacture of an azo dyestuff which may be developed on the fiber.



barren s'rATEs PATENT CARL MN LLER, 0F BIEBRIO H-ON THE-B,HINE,GEBJVIANY, ASSIGNOR TO THE FIRM OF KALLE AND COMPANY.AKTIENGESELLSCHAFT, 0F BIEBRICH-GN-THE-RHINE, GER- MANY.

MANUFACTURE OF AN AZO DYESTUFF WHICH MAY BE DEVELOPED ON THE FIBER.

No Drawing.

.v To all whom it may concern:

Be it known that I, Cam. Mt'ILLnR, a'citizen of the German Empire, andresident of Biebrich-on-the-Rhine, Germany, have invented certain newand useful Improvements in the Manufacture of an Azo Dyestutf 'hich Maybe Developed on the Fiber, of which the following is a specification.

I have 'found that by combining the l-diazonaphthalene-Z-sulfonic acidwith cc-naphthylamin, diazotizing the obtained product and coupling itwith 2-amino-5- oxynaphthalene-T-sulfonic acid, a coloring matter can beproduced, which, when diazotized on the cotton fiber and coupled with anaphthol gives .luable shades fast to washing and light.

To obtain the described coloring matter, I proceed as follows, the partsbeing by weight.

Example 1: 4.5 parts of the sodium salt of1-amino-naphthalene-Q-sulfonic acid are I appeared, the goods are passedthrough an alkaline bath of sodium beta-naphtholate, un-

til the coupling is completed. The shade thus obtained is a bl ue, fastto washing, whereas the original shade is a violet not fast to washing.By substituting the l-amino- Specification of Letters Patent.

Application filed November 18, 1913. Serial No. 800,876.

Patented Oct. 13, 1914.

oif and washed. The diazo compound is stirred up with cold water andintroduced into 2t parts of Q-amino-5-oxynaphthalene- 7-sulfonic acid,dissolved in cold water with the addition of soda. The obtained productis filtered off, washed and dried. In the form of the 'free acid it hasa formula graphically represented as follows:

naphthalene-Q-sulfonic acid in the first place by other usual componentsone obtains dyestuffs which do not possess a similar fastness to washingsimultaneously with the same good fastness to light, even after theyhave been developed with fi-naphthol.

I claim:

1. Process for producing an azo-dyestuit which after being developed onthe fiber gives shades fast to washing and light, con sisting incoupling l-diazo-naphthaleneflsulfonic acid with alpha-naphthylamin,diazotizing the obtained product and combin- 5 obtainable by combiningl-diazo-naphtha- 1o powder, soluble in Water with a red-violet ing itwith Q-aminO-5-oxynaphthalene-7-sul- As a new product the alkali salt ofthe ionic acid. i disazo-dyestuff of the following formula:

I with a cherry-red; in sulfuric acid with a lene-Q-sulfomc acid withalpha-naphthylbluish-black color insoluble in ether and amin,diazotizing and coupling in an alkapractically insoluble in benzene.line solution, with 2-amino-5-0Xy-naphtha-- In testimony whereof I havesigned my lene-7-sulf nie acid; being a bronze-like tW o subscribingWitnesses. color; from which solution acids precipitate the acid of thedyestufi in form of violet I CARL MULLER iii-alias, alkali: hydroxidturning the color of Witnesses:

solution. to blue and precipitating the OTTO KEMPF,

alixaii salt of the dyestufi; soluble in alcohol FRITZ KIcTRoom.

name to this specification in the presence of 20

